<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>注册页面</h1>
<form action="http://www.baidu.com">
  <!--name属性是所有控件必须添加的属性, 如果不添加则不传递此控件的内容
  maxlength最大字符长度 value设置默认值 readonly只读
  placeholder占位文本-->
  用户名:<input type="text" name="username" maxlength="5"
             value="tom" readonly
             placeholder="请输入用户名"><br>
  密码:<input type="password" name="password"
            placeholder="请输入密码" ><br>
  <!--checked设置默认选中 单选框必须设置value 否则提交on-->
  性别:<input type="radio" name="gender" value="m" id="r1">
  <label for="r1">男</label>
  <input type="radio" name="gender" checked value="w" id="r2">
  <label for="r2">女</label><br>
  <!--多选框和单选的属性通用-->
  兴趣爱好:<input type="checkbox" name="hobby" value="cy">抽烟
  <input type="checkbox" name="hobby" value="hj" checked>喝酒
  <input type="checkbox" name="hobby" value="tt">烫头<br>
  生日:<input type="date" name="birthday"><br>
  靓照:<input type="file" name="pic"><br>
  所在地:
  <select name="city">
    <option>北京</option>
    <option selected>上海</option>
    <option value="gz">广州</option>
  </select><br>

  <input type="submit" value="注册">
  <input type="reset">
  <input type="button" value="自定义按钮">
  <hr>
  <button type="submit">注册</button>
  <button type="reset">重置</button>
  <button type="button">自定义按钮</button>
</form>
</body>
</html>